(x-40)x=180

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Solution for (x-40)x=180 equation:


Simplifying
(x + -40) * x = 180

Reorder the terms:
(-40 + x) * x = 180

Reorder the terms for easier multiplication:
x(-40 + x) = 180
(-40 * x + x * x) = 180
(-40x + x2) = 180

Solving
-40x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
-180 + -40x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-180 + -40x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + -40x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + -40x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + -40x + x2 = 0 + 180
-40x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
-40x + x2 = 180

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = 180 + 400

Reorder the terms:
400 + -40x + x2 = 180 + 400

Combine like terms: 180 + 400 = 580
400 + -40x + x2 = 580

Factor a perfect square on the left side:
(x + -20)(x + -20) = 580

Calculate the square root of the right side: 24.083189158

Break this problem into two subproblems by setting 
(x + -20) equal to 24.083189158 and -24.083189158.

Subproblem 1

x + -20 = 24.083189158 Simplifying x + -20 = 24.083189158 Reorder the terms: -20 + x = 24.083189158 Solving -20 + x = 24.083189158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 24.083189158 + 20 Combine like terms: -20 + 20 = 0 0 + x = 24.083189158 + 20 x = 24.083189158 + 20 Combine like terms: 24.083189158 + 20 = 44.083189158 x = 44.083189158 Simplifying x = 44.083189158

Subproblem 2

x + -20 = -24.083189158 Simplifying x + -20 = -24.083189158 Reorder the terms: -20 + x = -24.083189158 Solving -20 + x = -24.083189158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -24.083189158 + 20 Combine like terms: -20 + 20 = 0 0 + x = -24.083189158 + 20 x = -24.083189158 + 20 Combine like terms: -24.083189158 + 20 = -4.083189158 x = -4.083189158 Simplifying x = -4.083189158

Solution

The solution to the problem is based on the solutions from the subproblems. x = {44.083189158, -4.083189158}

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